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Ok so for a 4 ohm svc old school sub, these pound. I have 3 of them in parrellel at 1.33 ohms and its hammertime... Custom truck Sealed triple enclosure, in my 2008silverado crew under the seat. Have been using hyperpros' for 10 years. Last longer than late model spl subs. Single 2" voice coil is low temp motor. Destoys subs twice its size due to high efficiency